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DhcpAckPacket.javaAPI DocAndroid 5.1 API3601Thu Mar 12 22:22:10 GMT 2015android.net.dhcp

DhcpAckPacket

public class DhcpAckPacket extends DhcpPacket
This class implements the DHCP-ACK packet.

Fields Summary
private final InetAddress
mSrcIp
The address of the server which sent this packet.
Constructors Summary
DhcpAckPacket(int transId, boolean broadcast, InetAddress serverAddress, InetAddress clientIp, byte[] clientMac)

        super(transId, Inet4Address.ANY, clientIp, serverAddress,
            Inet4Address.ANY, clientMac, broadcast);
        mBroadcast = broadcast;
        mSrcIp = serverAddress;
Methods Summary
public java.nio.ByteBufferbuildPacket(int encap, short destUdp, short srcUdp)
Fills in a packet with the requested ACK parameters.

        ByteBuffer result = ByteBuffer.allocate(MAX_LENGTH);
        InetAddress destIp = mBroadcast ? Inet4Address.ALL : mYourIp;
        InetAddress srcIp = mBroadcast ? Inet4Address.ANY : mSrcIp;

        fillInPacket(encap, destIp, srcIp, destUdp, srcUdp, result,
            DHCP_BOOTREPLY, mBroadcast);
        result.flip();
        return result;
public voiddoNextOp(DhcpStateMachine machine)
Notifies the specified state machine of the ACK packet parameters.

        machine.onAckReceived(mYourIp, mSubnetMask, mGateway, mDnsServers,
            mServerIdentifier, getInt(mLeaseTime));
voidfinishPacket(java.nio.ByteBuffer buffer)
Adds the optional parameters to the client-generated ACK packet.

        addTlv(buffer, DHCP_MESSAGE_TYPE, DHCP_MESSAGE_TYPE_ACK);
        addTlv(buffer, DHCP_SERVER_IDENTIFIER, mServerIdentifier);
        addTlv(buffer, DHCP_LEASE_TIME, mLeaseTime);

        // the client should renew at 1/2 the lease-expiry interval
        if (mLeaseTime != null) {
            addTlv(buffer, DHCP_RENEWAL_TIME,
                Integer.valueOf(mLeaseTime.intValue() / 2));
        }

        addTlv(buffer, DHCP_SUBNET_MASK, mSubnetMask);
        addTlv(buffer, DHCP_ROUTER, mGateway);
        addTlv(buffer, DHCP_DOMAIN_NAME, mDomainName);
        addTlv(buffer, DHCP_BROADCAST_ADDRESS, mBroadcastAddress);
        addTlv(buffer, DHCP_DNS_SERVER, mDnsServers);
        addTlvEnd(buffer);
private static final intgetInt(java.lang.Integer v)
Un-boxes an Integer, returning 0 if a null reference is supplied.

        if (v == null) {
            return 0;
        } else {
            return v.intValue();
        }
public java.lang.StringtoString()

        String s = super.toString();
        String dnsServers = " DNS servers: ";

        for (InetAddress dnsServer: mDnsServers) {
            dnsServers += dnsServer.toString() + " ";
        }

        return s + " ACK: your new IP " + mYourIp +
                ", netmask " + mSubnetMask +
                ", gateway " + mGateway + dnsServers +
                ", lease time " + mLeaseTime;